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APPENDIX: SAFE WORKING PERIOD (SWP)
CALCULATION
The end of the Safe Working Period (SWP) must be calculated in accordance with the ISO
12482-1 standard during each recurring inspection and service. If the component does not
have a condition monitoring unit, use the following method to calculate the remaining SWP%.
Note: If a condition monitoring unit is fitted, it performs the SWP calculation
and displays the remaining SWP% automatically.
Note: The condition monitoring unit can be retrofitted as a modernization to
enhance safety. Contact your supplier for more details.
Note: The values used in each SWP calculation, as well as the result and date,
must be carefully recorded in the log book. Each SWP calculation requires the
use of figures recorded during previous calculations.
Step 1: Calculate the motor operating hours (running hours) per inspection interval, Ti
Check the following values for this inspection interval:
J = the number of working days during the inspection interval [days]
H = the average hoisting height [m]
N = the average number of work cycles per hour [cycles/h]
T = the average daily working time [h]
V = the maximum hoisting speed [m/min] (as shown on the data plate)
Use the following formula to calculate T
i
, the motor operating hours (total lifting time) per
inspection interval:
For example, if we use:
J= 180 [days], H = 5 [m], N=20 [cycles/h], T= 12 [h], V=5 [m/min]
Step 2: Calculate the actual load spectrum factor per inspection interval, K
mi
1. Divide the total lifting time in proportion to the actual load spectrum during the inspection
interval. For example, if the product has lifted full loads (100%) for half of the time and no
load (0%) for half of the time then record 50 for each of these in the “Lifting time %，’ column
of the table below.
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